Nikon has released the D4s, an upgraded version of their flagship D4 DSLR. The new Nikon D4s Digital SLR Camera sports a new 16.2-megapixel sensor, faster processor, and a faster autofocus system. The D4s claims to be even better in low-lighting than the D4 (which was already quite impressive). As a comparison the original D4 offered ISO settings of Lo1 (ISO 50) to Hi4 (ISO 204,800), while the new D4s offers Lo1 (ISO 50) to Hi4 (ISO 409,600).
The D4s improves only slightly faster with a burst rate of 11fps (as opposed to 10fps). For video shooters, the previous D4 offered 1080p Full HD video at 30/25 or 24p, while the new D4s camera now adds on 1080p Full HD video at 60fps. If i'm correct, the D4 also offered a clean HDMI signal that can be recorded from. Still, the price point of this camera may appeal more towards professional photographers over video shooters.
There's more to the new D4s, and additional information about the new Nikon D4s DSLR Camera can be found via Adorama (click here).
Nikon D4s Digital SLR Camera